You are planning a pooled multi-session AVD host pool for 200 knowledge workers who run Microsoft 365 apps, multiple browser tabs, and Teams. Load testing shows the workload is memory-bound long before CPU saturation is reached, and per-user memory footprint is high due to numerous concurrent sessions. You must choose an Azure VM family that provides the best price-to-performance balance for this scenario while avoiding wasted compute. Which VM series should you select for the session hosts?